Heredity Continued

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Generation

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The entire group of offspring produced by a given group of parents

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Allele

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One of two or more alternative forms of a gene, leading to a unique trait

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Dominant

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Describes an allele that is fully expressed whenever the allele is present in an individual

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recessive

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Describes an allele that is expressed when there is no dominant allele present in an individual

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Genotype

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A specific combination of alleles in an individual

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Phenotype

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The detectable trait or traits that result from the genotype of an individual

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Homozygous

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Describes an individual that carries two identical alleles of a gene

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Heterozygous

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Describes an individual that carries two different alleles of genes

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Punnett Square

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A graphic used to predict the results of a genetic cross

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Probability

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The liklihood that a possible future event will occur in any given instance of the event; the mathematical ratio of the number of times one outcome of any event is likely to occur to the number of the possible outcomes of the event.

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Pedigree

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A diagram that shows the occurrence of a genetic trait in several generations of a family.

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Genetic disorder

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An inherited disease or disorder that is caused by a mutation in a gene or by a chromosomal defect.

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Linked

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In genetics, describes two or more genes that tend to be inherited together.